Steam-valve



(No Model.) I 4 Slieets-Shee'c 1 G. S. DETRO. STEAM VALVE;

Patentd June 20 I l I Il N4 PETERS. Phato-Lflhographar. Washington. D4 0.

(No Model.) 4 Sheet -Sheet 2-.

C. S. DETRO.

STEAM VALVE...

M'Memes; I

No.259,827'. A jgja Patented June 20, 1882..v

(No ModeL 0. s. DBTRO.

4 Sheets-'Sheet- 3;

STEAM VALVE.

No. 259,827. Patentegi June 20,1882.

(No Model.)

. 0. DETRO.

' STEAM VALVE. V No. 259,827., Patented June 20, 1882.

N PETERS. Fholo-Lilhugnpher. Wash; n nn nn c.

4 Sheets-Sheet 4.

I UNITE STATES PATENT OFFICE.

CLARENCE S. DETRO, OF ASHLEY, PENNSYLVANIA.

STEAM- VALVE.

SPECIFICATION forming part of. LettersPatent No. 259,827, dated June 20, 1882. Application filed March 16, 188 2. (No model.)

the claims.

In the drawings, Figure l is a side elevation of the exterior ofthevalve-ohest; Fig. 2, a view of the same, showing the position of the inte rior parts in dotted lines; Fig. 3, a top plan view of the plug; Fig. 4, a top plan view of the casing, showing in dotted lines the arrangement of the interior parts; 'Fig. 5, an end elevation; Fig. 6, a vertical cross-section of the large end of the valve and chest; Fig. 7, a vertical cross-section taken a short distance to the rear of Fig. 6; Fig. 8, a vertical cross-section at the rear end of the valve. Fig.9 is a vertical longitudinal section of the plug. Fig. 10

is a vertical longitudinal section of the valvecasing, and Fig. 11 an end view of the same.

A is the valve-casing, and is made of theform shown and of sufficient size to afford space within it for the plug and necessary steam and exhaust ports, as will be hereinafterfully set forth. Its lower portion is extended outwardlyin the form of a plate, a, and bolts onto the cylinder-saddle, the upper edge of which is shown at 1, Fig. 1. Increased thickness of metal is shown in the surface of the casting at a and a? for the passage of the steamways mentioned above. The rear end of the cylindrical portion of the chest or cylinder is' closed bya head, or, which may be bolted or cast to it, as shown. The forward end of the chest or cylinder is larger than the rear end, in order to accommodate the tapering form of the plug, and has bolted to it the head a", through which operates the large end of the plug. Within the head is arranged a suitable stuffing-box and a flange, a, to prevent leakage. The-forward portion of the cylinder is also provided with an annular recess, a, which afl'ords sufficient space to prevent wire'drawing of the steam. The interior of the cylinder tapers from the forward end of its upper side downwardly through the bottom portion, a, of

the chest, and connect with the steamways in the cylinder-saddle. The entrance-ports a extend from the outer lower edges of the cylinder upwardly around its sides, and have inlet into the steam-space a in the forward portion of the cylinder through ports a in its upper portion, as shown.

B is the plug. It consists of a round tapering hollow portion,b,and around hollow head, b, which projects through the head of the cylinder and has attached wit the rocker-arm b The lower side of the portion 1) is made solid, and has arranged in its lower side the exhaustcavity 11 The cut-off ports b are arranged upon each side, and above the exhaust-cavity communicate with the interior of the plug, and are arranged slightly in a diagonal position, that they may communicate along their entire length with the cylinder-ports, which are also arrangedin like manner, as shown. Steam is admitted to the interior of the plug through a recess, 11 out between the body I) and head b of the plug, and shown in Fig. 9. When the plug is in position this recess is upward and communicates freely with the space a. The head b of the plug is also made hollow, so that additional steam-room may be secured, and also to prevent the entire pressure of the steam from pressing the plug into the casing. Upon the upper side of the plug, and running its entire length, is a groove, 0, and extending from the large end of the plug, upon each side of the groove 0, and connecting with it at difi'erent points along its course, are supplementary grooves 0. Around the small end of the plug, and communicating with the steam, are arranged short notches 0 as shown. There are also notches 0 out in. the large end of the cylinder, as shown. The object of these notches and grooves is to counteract the force exerted by the steam to press the plug into the valve by exerting a pressure in the opposite direction, and thus making a perfectly-balanced valve. The steam entering the large end of the valve through the recess 1) travels along the grooves c and 0' into the steam-space behind the small end of the valve, and exerts a counteracting pressure against the plug. The notches c and cylinder-notches 0 also aid in preventing the valve from binding. The notches c 0 also act as lubricators, an oil-cup being situated at any convenient place upon the medium line of the cylinder. In the operation of the valve a rocking motion is communicated to the plug by the rocker-shaft. The steam enters the interior of the plug, passes into the cylinder-ports through each cut-off port alternately, and escapes through the exhaust-cavity. The pressure on the valve is equalized by the admission of the steam to the rear end of the valve and by the notches, so that a free motion is secured. As the parts wear, the plug will of course sink: farther into the cylinder. This is provided for by having the large end project slightly out of the bore.

In the wearing of the plug a shoulder is prevented from forming in the small end of the cylinder, where the plug terminates, by the continuance of the bore parallel from that point, as shown.

What I claim is- 1. The plug B, having a central groove, 0, and supplementary grooves 0, adapted to admit steam into the space behind the plug, and with notches 0 arranged around its small end, substantially as and for the purposes set forth.

2. The combination of the casingA, having entrance-ports a inlet-ports a steam-space a, cylinder-ports 3, and exhaust-cavity 2, head a", stoning-flange a and notches o 'with the plug B, having a hollow head, b, which projects from the large end of the cylinder and has attached to it the rocker-arm I), which connects with the actuating machinery, having steam recess or inlet b cut-ofl'ports b, and exhaust-cavity b and notches c, c, and c, all arranged to operate substantially as shown and described.

In testimony whereof I afiix my signature in presence of two witnesses.

CLARENCE S. DETRO.

Witnesses:

J. K. P. FENNER', T. J. CLINTON. 

